A dialectal or archaic term for a vane, or possibly a variant of 'gyre' (a circular motion or form).
Uncertain etymology; possibly from Old Norse gyrr or related to gyre. The term is extremely rare and may be Scottish or Northern English dialect.
Words like 'gire' are linguistic mysteries—they appear in old texts but fade from use, sometimes because they were local dialect words never standardized into written English.
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